Turret control



1 3 w. R. TUCKER 2,325,348 TURRET CONTROL Original Filed April 22, 1940 4 Sheets-Sheet l IIIW 6 July 27, 1943.

FIE-.3

Original Filed April 22, 1940 W. R. TUCKER TURRET CONTROL 4 Sheets-Sheet 2 a" 94 l 95 V 97 F I A lA/VENTOP y 1943- w. R. TUCKER 2,325,348

TURRET CONTROL ori inal Filed April 22, 1940 4 Sheets-Sheet s ATTORNEY;

y 1 w. R. TUCKER 2,325,348

TURRET CONTROL Original Filed April 22, 1940 4 Sheets-Sheet 4 CQ NTRQL i iELGBm it No.

control systems, and lit presses having TGlZMEi tu workpieces to the pc object of this iove to provide it movement of the turret its one pcsi their position is hydraulical and gradually slou'e the turret appiceches its new position, so to avoid any jar O1 shock;

Another object oi the inve on consists in providing a turret press in W 1e turret is shii'ted from one worlii e position to another working position by more hydraulic means.

Another object is to provide a turret press in which the turret may be hydraulically lifted. oii its Working position, these er hydraulically IQ" tated by predetermined and then hydraulically lowered into another working positlon.

Another object is to provide a poem of the above character which theshiiting movement of the turret is controlled by a hydraulic motor.

A still further object of the invention is to provide a tumet press in which the shiitiug movement of the turret item one wor 'og position to another working positioiiis coo. oiled by a hydraulic motor, which once started controls valve means for determining the proper sequence of the movements of the tuii'et during a shifting movement from one working position to another working position.

one

woo,

on its cycle Dayton, @hio, assignolr to The out (Cooperation, inc, Willfiell, a corporation oi? lillelavvaie iloiil 22, 11sec, Social No. this applicotiou Apt-ail 13,

(@l. iii-=20) its rotation, its lowering upon the press bed and It is a still. further object of the invention to provide a turret press in which shifting movement of the turret from one working position to another working position effected by a h draulic motor, the cycle of c -ich is initiated by closing an electric circuit and in which the said hydraulic motor, its cycle, controls said electric circuit for determining the sequence of the motor movements.

A stili further object of the invention is to provide a turret'press in which the shifting movement of the turret from one working position to another working position is controlled by a hydraulic motor which may be miciomatically adjusted for the exactly desired shifting movement of the turret.

Another object of the invention to provide a turret press in which the various movements of the turret are timed automatically in a predetermined sequence without the necessity for attention thereto by the operator, or the dependence upon his judgment, such movements including lifting of the turret ed the press bed,

the locking of the turret.

These and other objects and advantages of the invention will appear more clearly from the icilowing specification in connection with the ac" companying drawings.

This application is a division of my copeuding application, Serial No. 330,870, filed April 22, 19%.

In the drawings:

v Figure l is a perspective view of a turret press in which the turret is rotatable about one of the strain rods.

Figure 2 is a view partly in section of the press of Figure 1 on a somewhat larger scale.

Figure 3 is a section through the lower portion of Figure 2, including the press bed and the hydraulic motor for operating the turret.

Figure l is a section along the line 4-6 of Figure 3.

Figure 5 shows a hydraulic and electric control circuit for the turret press according to the present invention.

Figure 6 illustrates a detail of the controlling mechanism cooperating with the control circuit shown in Figurefi.

General arrangement which effects the lifting and lowering movement of the turret, whereas another cylinder piston assembly causes the rotating movement of the turret.

According to the present invention, the lifting cylinder piston assembly first spaces the turret from the press bed, then is rotated together with the turret by another cylinder piston assembly, whereafter it is lowered to seat the turret again i on the press bed, and finally is rotated by means of the other piston cylinder assembly to its initial position so as to be ready for a new cycle.

The movements and sequence of movements of the hydraulic motor fo carrying out the indexing movement of the turret, is controlled by ram III and the valve rod IZI.

trlc circuit controlled, in its turn, by movements of the hydraulic motor.

Mechanical construction :Referring to the drawings in detail, the press disclosed therein comprises a press bed 81 and a press head 80 interconnected by three strain rods 89 and 89:: with nuts 90 threaded upon the ends thereof. slidably mounted on the strain rods 09 and 89a is a press platen 8| connected with the pressing plunge 02 and being adapted to carry an upper die cooperating selectively with one of a plurality of dies to be mounted in the die receiving members 93 arranged along a circle on the turret 90. The turret 94 of Figure 1 is rotatable about one of the strain rods, na .nely, the strain rod 88a.

As will be seen from Figure 3, the strain rod 89a guides by means of bushings 95 and 86, a sleeve 91 having its flange 90 threaded to, or otherwise connected with the turret 94. Also connected by screws, or other convenient means, with the turret 94 is a clutch member 99 having jaws I adapted to engage corresponding recesses IOI of a sleeve I02. The sleeve I02 slidably surrounds a portion I03 of the strain rod 89a and is adapted to be reciprocated relative thereto, by means of fluid introduced through passageways I04, Mia and I05, I050; respectively. In order to prevent leakage at the ends of the sleeve I02, packing material 0 and 9 is provided and respectively compressed by glands I06 and I0'I. Furthermore, to establish a close fit of the strain rod portion I03 in the sleeve I02, piston rings I08 are provided at the periphery of the strain rod portion I03.

The sleeve I02 is provided at its outside with a gear segment I09 meshing with a circular rack H0 provided on a ram, generally designated II I. The teeth on the segment I09 and on the rack I III are so elongated as to remain enmeshed even when the lifting sleeve I02 is in its lowermost position. The ram III is provided with two piston heads I i2 and H3 reciprocably mounted in cylinders III and H respectively. The cylinders Ill and I I5 are mounted in the casing IIB, forming a part of the bed 81, and simultaneously act as glands compressing the packing material II! and H8 respectively mounted between the lower portion of the cylinders lid and H5 and cylindrical portions Iii and I respectively of the casing IIB.

The ram III comprises an axial bore traversed by a valve rod IZI' having slots I22 and/I20 at its ends fitting closely into bores I20 and I25 of the cylinder head portions I20 and I21! respec tively. The ends of the valve rod IZI extend into the cavities 55a and 50a formed in the cylinder head portions I20 and I2'I respectively.

Fixedly carried on the outer ends of the piston heads II2 and II3 are plates tlla and 58a respectively surrounding the valve rod I2I with constant clearance, which clearance is comparable to the clearance existing between the The plates 57a. and 50a are each formed with a radially extending groove 5% and 60a. respectively, which serves to admit the pressure fluid into the pressure cavities did and 52:. formed in the cylinder head portions I20 and I2? respectively in a manner which will presently appear. The plates 570; and tea are formed with an annular abutting portion 63a and 0011 respectively, which is adapted to abut the inner faces that and 60a of the ends of the cylinder head portions I26 and Iii. The plates 51a. and 580 are each further provided with an annular recess within which is received the floating rings 0M and 68a respectively. The floating rings 67a and 00a are held inplace by the plates S'Ia. and 58a and allowed to move radially to prevent binding of the valve rod IZI due to any misalignment thereof with the rings 81a and 68a and with guides 53a and 54a. The floating rings 61a and 60a slidably engage the surface of the valve rod I2I with an extremely close clearance, whereby the escape of pressure fluid along the rings toward the middle of the valve rod I2I is prevented. This construction is exceedingly reliable and compact, and allows the valve rod IZI to shift readily without having the seal destroyed. It will be understood that the rings 61a and 68a likewise engage the surface of the plates 51a. and 58a and of the cylinder head portions I26 and I21 slidably, but with extremely close clearance.

The valve rod I2I has axial holes 69a and 10a drilled from both ends of the valve rod I2I, as viewed in Figure 4, and communicating with the slots I22 and I23 at the ends of the valve rod I2I. On the right-hand end of the valve rod I2I (with respect to Figure 4) toward the inward end of the hole 68a are four radial connecting bores 18a whichare relatively large in diameter and adapted freely to connect the bore 69a with the chamber Bid. in the cylinder head portion I26. The other end of the valve rod I2I is similarly provided with identical holes I ia. Located outwardly of these holes 73a and Ida are a series of longitudinal spaced connectin holes 15a. and 16a respectively; these holes 15a. and 10a are progressively more closely spaced and of progressively smaller diameter as one proceeds outwardly fromthe holes 130 and Ma. The holes 15a and 16a are disposed in a single row on only one side of the valve rod IZI instead of extending in four directions as do the holes 7341. and Ida, and these holes 7511 and IIia'likewise communicate with the bores 09a. and 10a.

The ends of the valve rod iii are adapted to abut against threaded plugs Ila and 78a, which are threadedly mounted in the ends of the cylinder head portions I26 and I2! respectively. These plugs Il a and 10a are covered by removable end caps I011. and 800 respectively, which serve to prevent unauthorized changes in the positions of the plugs, and also serve to prevent leakage around the plugs.

Communicating with the cavities or chambers 55a and 560 are conduits aid and 82a. respectively, which are adapted to act either as inlet or discharge conduits, depending on the direction in which the ram III is bein moved. The plugs l'ia and 700, are 50 adjusted that when the valve rod Iii abuts against one of them, the slot I22 or I23 in the other end of the valve rod I2I is adapted to freely interconnect the conduit Illa or 820. and the chamber 555a or 5011. with the pressure cavity em or 02a, this being accomplished by having the slots I22 and I 23 made of such a length that the slots extend into the interior of the chamber Ii In or 02a. This is indicated atthe right-hand end portion of Figure 4, in which the slot I 22 has a considerable portion disposed within the chamber Ilia and, hence, is adapted to allow free entry of the pressure fluid from the conduit am into the chamber aid where it may act upon the piston head I I2 of the ram I I I to move the same away from the fiuid inlet.

when the valve rod 8 2i abuts one of the plugs Fla or lilo, its slot iii or iii is in non-relationship with the pressure cavity did or did as is indicated in the left-hand end portion of Figure 4, whereby when the pressure fluid is first admitted, its first action is to move the valve rod iii axially into engagement with the other plug lla or its. This action also serves to bring the slot iii or 23 in communication with the chamber did or the, thereby allowing the pressure fluid to act upon the piston head H2 or M3.

The device shown in Figure 4: is furthermore provided with micrornatic screws did and s id respectively mounted at each end of the cylinder head portions 626 and i2? and adapted, if desired, to engage the adjacent iston heads iii and iifii so as to stop the same. These micromatic screws Sta and 86a allow a rnicromatic adjustment of the stroke of the ram iii. In order to prevent undue operation of the niicromatic screws that and E la from the outside oi the device, protectmg caps 85a and 86a, similar to the caps Mia and illia, cover the outer portion of the micromatic screws 83a and Ma, while simultaneously acting as looking nuts.

The stroke of the ram iii is sumcient to produce the desired rotation of the vertical lifting cylinder I02 (Figure 3). After this desired rotation has been accomplished, the finished surface of the annular abutting portion- 631:. or Lida of the plate la and 58a or ram ill will be in connection with the finished surface the or that. respectively on the inward surface of the cylinder head portions lit or ill.

The reverse rotation to the same extent of the lifting cylinder I02 will bring the corresponding surfaces 63a or 64a into connection with the surfaces 65a or 66a. Thus Figure 4 corresponds to a position in which the ram iii is in one of its end positions and ready for a stroke to bring about a rotation of the lifting cylinder 5 02. Upon completion of the rotation of the lifting cylinder )2 by movement of the ram l H toward the conduit 8 la, the surface 63a of the plate 51a will be in corresponding contact with the surface 65a of the cylinder head portion ift.

Likewise, in Figure 4 the admission of pressure fluid through the conduit tic will cause the valve rod E2! to move toward the plug 11a. and eventually to abut the same, whereupon pressure fluid will freely flow through slot 123 into the chamber 62a where it acts upon the piston head H3 to move the ram Ill toward the surface 650 of the cylinder head portion I26. As the ram Hi approaches the limit of its travel toward the surface 65a, the cushioning action will takeplace, this cushioning action being more fully described below in connection with the operation of the device. Similar operation will take place when the ram Hi moves in the reverse direction.

Referring again to Figure 3, the-turret 94 rests upon the press bed 81 and is held in its respective position by one or more holding pins I28 engaging a corresponding lined recess I29 in the turret 94.

As will be clear from the above, the sleeve I02 may be lifted so as to have its jaws Hll engage the corresponding recesses Hill of the turret 94,

l and to lift the turret 94 for disengaging the same from the holding pin or pins I28. By operation by the blades The detailed rotating and indexing operation will be more fully described is-slow.

Hydraulic and; electric control circuit Referring now to Figure 5 diagrammatically illustrating the hydraulic and electric control circult, bore Edd (Figure 3) is connected with a conduit c leading a four-way valve iii comprising valve member. (not shown) which is are d into its upper position by of a spring and adapted selectively to establish commundcation of the conduit tee with a conduit E33 leading to the pressure sideof a pump its by means cia conduit its, or to estahl sh communication hetween the conduit ids and the conduit leading to a fluid tanl; till by means of a conduit The here (Figure 3') in the strain rod portion iii-ii communicates with a conduit its, iiirewise leading to the four-way valve wt and adapted selectively to be connected with a conduit its branching ofi frorn'the conduit lat, or to be connected with the conduit 633.

The shaft Mi oi the valve member of the fourway valve iti is operatively connected with the armature M2 of an electric relay M3, the terminals or which are connected with the lines M6 and its, the latter leading to the main supply line lit. The line idl'leads to a contact M1 spaced from a contact Mid connected by line MS with the main supply line its. The main supply line 656 is connected with a relay coil l5! associated with the armature W2 carrying the switch blades G58 and lid, the latter of which is adapted to bridge the contacts MT and I48.

The relay coil lei is connected on one end with a contact E55 by means of the line H6, and on the other end with a contact ib'i by means of the line its. The contact i555 cooperates with the normally closed switch I59 connected by the line Hill with a contact lhi adapted to be connected with a contact @652 by means of the armature blade 353. The contact M2 is connected by the line Hi3 with the main supply line M6, which latter is connected with a normally open limit switch its.

Depending on whether the contacts Ifil and IE2 and the contacts id'i and M8 are bridged whether th switch We is closed or not, relay M3 will either be energized or deenergized so that pressure fluid enters the hollow arm 32 either through conduit H9 or conduit I39 so that the lifting plunger 25 will perform either an upward stroke or a downward stroke.

A control circuit similar to that just described in connection with the strain rod portion N13 is provided for the ram ill in connection with the cylinder headportions We and I21. To this end the conduit Ma (Figure 4) is connected by means of a conduit it?! with a four-way valve I66 similar to th four-way valve l3l just described. Also in this valve Hit, the valve member (not shown) is continuously urged into its upward position by means of a spring I51 and has its shaft M8 operatively connected with an armature 369 of an electric relay Hi].

The terminals of the relay H0 are connected by means of the, lines Hi and H2 with a contact I13 and main supply line I50 respectively. Associated with the contact H3 is a second contact I'M connected-by line H5 with'the other main supply line M6. Similar to the control circuit described in connection with the hollow arm 32, the contacts H3 and H4 may be bridged by an armature blade Ill of the armature Hi, the reits and its respectively, and

.-lay coil I19 of which is connected by means oi.

line I80 with the main supply line I46, and by means of th line I8I with the contact I02 of a normally closed switch I83 having its other contact connected by line I84 with a contact I85. Associated with the contact I85 is a contact I85 connected through line I81 with a main supply line I50 and adapted to be connected with the contact I85 by the plate I88 likewise carried by the armature I18.

The relay coil I19 is furthermore connected by line I89 with the contact I90 cooperating with a normally open switch I9 I, the other contact being connected with the main supply line I50.

As will be clear from the above, the energization and deenergization of the relay I10 will ause the pressure fluid from the pump I34 to pass through the conduit I92 connected with the conduit 32a, thereby moving the piston head H2 away from the conduit 82a, or will direct the pressure fluid passing through conduit I85 into the conduit 82a, thereby moving the piston head M3 toward the conduit 82a.

The hydraulic circuitshown in Figure 5 furthermore comprises a pressure relief valve I83 mounted in a conduit I98 connecting the conduits I38 and I35.

Figure 6 shows a portion of the turret having arranged on its periphery a plurality of cam blocks, generally designated I95, and comprising three cams I95, I91 and I98. The number of the cam blocks corresponds to the number of turret stations or die receiving members 93. The cams I96, I91 and I98 are so arranged that the cam I96 cooperates with the switch I9I, while the cams I91 and I98 cooperate with the switches I59 and I83 respectively.

Operation When the pressingplunger approaches the end of its retraction stroke, the limit switch I64 is momentarily closed. either manually or automatically, for instance, by means of the pressing platen, so that the circuit through the relay coil I5I is closed. Current then flows from the main supply line I46 through switch I54, line I58, relay coil I5I, to the main supply line I50. The energization of the relay coil I5I causes attraction of the armature I52 so that the blade I53 of armature I52 bridges the contacts I81 and I62, while the armature blade I54 bridges the contacts I41 and 148. Since the switch I59 is normally closed, the release of the limit switch I63 will not cause deenergization of the relay coil I5I, since the attraction of the armature blade I53 closes the holding circuit for the relay coil I5I, which holding circuit comprises the main supply line I48, the line I63, contact I52,.blade I53, contact IIiI, line I60, switch I59, contact I55, line I55, relay coil I5I and main supply line I50. The attraction of the armature blade I59 closes the energizing circuit for therelay I43, said circuit comprising the main supply line I36, line I35, relay I 53, line I44, contact I51, blade I59, line I99 and main supply line I50.

The energization of the relay I53 causes a downward movement of the armature I92 against the thrust of the spring I32, thereby also moving downwardly the shaft I II pertaining to the valve member of the four-way valve 13E. Downward movement of the valve member pertaining to the four-way valve I3I establishes communication between the conduit I39 and the conduit I33 connected with the pressure side or the pump I36 and I38. Consequently, pressure fluid from the pump I34 passes through the conduit I30 and enters the bore I04 in the strain rod portion I03, thereby lifting'the lifting cylinder I 02, which first causes engagement of the recesses or clutch elements IOI with the jaws or clutch elements I00 connected to the turret 94, and thereafter lifts the turret 93 to such an extent that it disengages the holding pin I28. During this lifting movement of the lifting cylinder I02, the fluid expelled from the cylinder I02 passes through the bores I05a and I05, the conduit I39, four-way valve I3I, conduits I40 and I38 to the tank I31.

As soon as the turret 94 has been lifted so as to disengage the holding pin I28, the cam I96 of the cam block I95 causes the switch I9I to engage the contact I 90, thereby closing an electric circuit comprising the main supply line I46, line I80, relay coil I19, line I09, contact I90, switch I9I and the main supply line I50. The closure of this circuit causes energization of the relay coil I19 so that the blades I88 and I11 respectively bridge the contacts I and I 85 and the contacts I13 and I14. The bridging of the contacts I85 and I85 establishes a holding circut for the relay coil I19 through the main supply line I46, line I80,

relay coil I19, line I8I, contact I82, the normally closed switch I83, line I84, contact I85, blade I88, contact I86, line I81 and the main supply line I50. The bridging of the contacts I13, I14, through the blade I11, closes a circuit comprising the main supply line I46, line I15, contact I10, blade I11, contact I13, line I1I,relay I10, line I12 and main supply line I50. The closure of this circuit energizes the relay I10 so that its armature I69, together with the shaft I68 of the valve member pertaining to the four-way valve I66, is moved downwardly against the thrust of the spring I61. This downward movement of the four-way valve I 58 establishes communication between the conduit I65 connected with the conduit 8Ia of the cylinder head portion I26 (Figure 4), and the conduit I38 leading to the tank I31.

The downward movement of the valve member.

pertaining to the valve I66 also establishes communication between the conduit I92 leading to the conduit 82a of the cylinder head portion I21 and the conduit I35 leading to the pressure side of the pump I30.

Pressure fluid from the pump I34 now flows through the conduit I92 and enters the passageway 82a of the cylinder II5 (Figure 4). Pressure fluid then passes from the passageway 82a into the slot I 23 and moves the valve rod I2I toward the plug 110. until it abuts the latter. When this movement of the valve rod I2I is completed, the slot I23 of the valve rod IZI will have passed through the close fitting guide bore I25 so that fluid, under pressure, can pass from the passageway 82d through the slot I23 into the chamber 52a in the cylinder II5, thus applying pressure upon the piston head II 3.

The ram III will now move toward the passageway di displacing pressure fluid from the chamber am through the holes 13a, 15a and thence out through the passageway 8Ia, the conduit I55, four-way valv I96 and the conduit I38 into the fluid tank I 31, thereby reducing reduction in the discharge area and a throttling oi the oil discharged from the chamber am. As the ram III approaches the end of its stroke aeaasas toward the passageway did, the ring bla covers sequentially the holes I511, thereby gradually still further reducing the discharge area and still further exerting a throttling effect of the discharge of the fluid, so that the said movement of the ram I I I gradually slows down until it is stopped by engagement of the abutting surface 63a of the cylinder head portions I 26.

The movement of the ram III, as just described, causes the rack lid, meshing with the gear segment IE9, to rotate the sleeve III? by a predetermined distance corresponding with the distance between two indexing positions, the end of this rotatin'g movement corresponding to the new indexing position. .When this position is reached, cam I97 of the next cam block I95 engages the switch I59, thereby breaking the holding circuit for the relay Iiil and, consequently;

,deenergizing the relay Idt so that the valve member of the four-way valve IQI is shifted into its upper position by the spring I32. Therefore. fluid pressure from the pump IN now passes through the conduits I35, I33, the four-way valve ItI and the conduit I39 into the bore IIIIS. From here the pressure fluid flows through the bore Itiia, the annular space between the strain rod portion N3, the packing material and the sleeve I02, thereby causing a downward movement of the sleeve I82.

When the jaws IIJI of the sleeve W2 have disengaged the clutch member at, in which position the turret M is seated upon the bed BI and locked by the holding pin I28, the cam I98 opens the switch I 33, thereby breaking the holding circuit for the relay III-l and deenergizing the relay I'III. Consequently, the valve member of the fourway valve I 66 is shifted to its upper position by the spring I61 and "pressure fluid from the pump IS I now passes through the conduit I65 into the passageway Bla, from where it enters the slot I22 of the valve rod I2I and moves the valve rod I2I toward the plug Illa until it abuts the latter. Fluid then acts upon the piston head H2 so as to move the ram III toward the passageway 820 while slowing down this movement when the ram III approaches the end of this stroke. During this movement fluid expelled by the piston head H3 passes through the conduit 82a, the conduit I92, the four-way valve I66 and the conduits I89, I38, into the fluid tank I37. The last mentioned stroke of the ram III returns the sleeve III2 to its previous angular position, so that the device is ready for another indexing movement.

Although in the above operation of the embodiments shown in the drawings, the indexing movement is described as being started at the end of the retraction stroke of the press ram, it is of course, understood that the indexing movement of the turret may be started at any other point of the retraction stroke of the press ram, if so desired. Also, the press ram may start its working stroke after the indexing movement has been completed and the indexing mechanism re-' turned to its initial position, or before the indexing movement has been fully completed.

Summary of operation The operation of the device according to the the cam I on the turret to close the switch IQI (Figure 5), thereby supplying fluid from the pump I36 to the bore 820; (Figure 4) and causing the ram III to perform one stroke.

This movement of the ram is transferred by the rack III) and the gear segment meshing therewith to the piston I92 so as to rotate the same together with the turret connected therewith by means of the clutch members IIII, Hill. In this way the turret is rotated by a predetermined angle, depending on the length of the stroke of the ram III. This rotative movement is slowed down at the end thereof by the gradual closing of the bores 13a and 150.. At the end of this rotating movement of the turret, the switch I59 is opened so that the supply of pressure fluid to the piston [I32 is reversed, resulting in a lowering of said piston, and declutching of said piston from the turret, thereby re-seating the turret on the press bed. In this position the turret opens, by means of the cam I98, the switch I83 causing a reverse movement of the ram III, which results in a reverse rotation of the piston I02, thereby returning the said piston to its initial position.

It will be understood that I desire to comprehend within m invention such modifications as come within the scope of the claims and the invention.

Having thus fully described my invention, what I claim as new and desire to -secure by Letters Patent is:

1. In a press, a press head, a press bed, a plurality of substantially vertical strain rods spacing and. connecting said press bed and said press head, a vertically reciprocable turret rotatable about one of said strain rods, a double-acting stationary piston forming a part of said last mentioned strain rod and cooperating with a cylinder slidable in longitudinal direction on said stationary piston and being rotatable about the latter, means connected to said cylinder for selectively engaging and is engaging said turret, and a reciprocable fluid operable member in constant driving connection with said cylinder for rotating the same.

2. In a press, a press head, a press bed, a plurality of strain rods spacing and connecting said press bed and said press head, a support adapted to receive a plurality of dies and being rotatable about one of said strain rods, hydraulically operable means for selectively lifting said rotatable support off or re-seating the same on said press bed, a hydraulic motor for rotating said support by a predetermined angle when performing one cycle, and means associated with said hydraulically operable means and responsive to a predetermined movement thereof for causing driving connection between said'support and said hydraulic motor, said motor comprising hydraulic means for slowing down the angular movement of said turret at the end of said angular movement.

3. In a press, a press head, a press bed, a plurality of substantially vertical strain rods spacing and connecting said press bed and said press head, a vertically reciprocable turret rotatable about one of said strain rods, fluid operable means associated with said turret for vertically reciprocating the same, hydraulic motor means in constant driving engagement with said fluid operable means for rotating said fluid operable means, and means associated with said fluid operable means and operable to connect the latter to said turret for rotation of said turret with said fluid operable means. i

4. In a press, a press head, a press bed, a plurality of substantially vertical strain reds spacing and connecting said press bed and said press head, a turret reciprocable on and rotatable about one of said strain rods, fluid operable means associated with said turret for vertically reciprocating the same, means operable in response to a predetermined movement of said fluid operable means to connect said fluid operable means to said turret for rotation of said turret with said fluid operable means, hydraulic motor means in constant driving engagement with said fluid operable means for rotating the latter, and electric means responsive to the reciprocating movement in vertical direction of said turret for controlling the direction of operation of said hydraulic motor means.

5. In a press, a press head, a press bed, a plurality of strain rods spacing and interconnecting said-press bed and said press head, a support for a plurality of dies rotatable about one of said strain rods, said one strain rod forming a stationary piston, a cylinder surrounding said piston and adapted to cooperate therewith so as to reciprocate on said piston for selectively lifting said support off or re-sea'ting said support on said bed, means operable to rotate saidcylinder by a predetermined angle, means operable to connect said cylinder and said support for rotation of said support with said cylinder, and hydraulic means, associated with the means operable to rotate said cylinder, for automatically slowing down said support at the end of its angular movement.

6. In a press, a press bed, a press head, a plurality of strain rods spacing and connecting said press head and said press bed, a support for a plurality of dies reciprocably and rotatably mounted on one of said strain rods and normally seated on said press bed, the said one strain rod being provided with a stationary double-acting piston having conduit means leading to each end of said piston, a cylinder slidably surrounding said stationary piston and being hydraulically reciprocable relative to said piston to lift said support ofi said bed, means associated with said cylinder and operable to establish driving connection between said support and said cylinder for rotation of said support with said cylinder, said cylinder being provided with a toothed portion, a reciprocable rack meshing with said toothed portion for rotating said cylinder, and

hydraulically operable means operable to reciprocate said rack and to slow down the same at the end of its stroke, said cylinder being operable to allow re-seating of said support on said bed after said support has been moved by a predetermined angle.

WARREN R. TUCKER. 

